Lexmark C734 Service Manual page 48

5026
Error code
84 <color> PC Unit
Missing
84 <color> PC Unit Near
Life Warning
2-14
Service Manual
Action
• Scroll down the operator panel to see if the printer is showing that all four of the PC units
are missing. If so, check the HVPS cable between the system board and the HVPS.
Ensure that the cable is not plugged in backwards on the HVPS. Disconnect and
reconnect the cable to make sure there is good contact.
• Insert or reinstall the specified photoconductor unit and see if problem clears. See
"Photoconductor unit removal" on page
• Remove the top access cover assembly (see
on page 4-40), and confirm that the camshaft follower (A) on the left side is not out of the
groove (B). If the camshaft follower is out of the groove, raise the arm, use a screwdriver
to ease the camshaft follower back into the groove. You need to press down to snap it
into position.
• Check the high voltage contacts path, especially the "finger" on the specified
photoconductor unit (printer is shown with components removed for clarity).
power supply
High voltage
contact path
Finger
• If the contacts are good, replace the HVPS. See
removal" on page 4-94.
• If the problem persists, replace the system board. See
page 4-139.
• Select Ignore to clear the message and continue printing.
• Order the specified photoconductor unit. When print quality is reduced, install the new
specified photoconductor unit using the instruction sheet that comes with the replacement
specified photoconductor unit.
• If the problem persists, replace the system board. See
page 4-139.
4-118.
"Top access cover assembly removal"
B A
High voltage
"High-voltage power supply (HVPS)
"System board removal" on
"System board removal" on